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Doing Something when number points are increased.

Hello guys.
First thing i want to ask you is how can i check is my number of points is growing or it is stuck at some number.

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I just want to activate particle system when the points are growing up and deactivate it when points are not growing.

Secoud thing is ive made this.

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Its just checking my foliage is that type if it is removing instanced static mesh and replacing it with Actor BP but i want to replace it with another diffrent instanced static mesh how can i make this?

so no one help ?